Headlights flickering off and on 1999 mustang

My headlights flicker off and on, usually after 20-30 mins after turnig them on. once this happens, the only way to keep them on is to pull the highbeam/turn signal toward me. is this related to the headlight switch or what do i need to check?and how do i fix it???

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Related Questions:

Some headlight bulbs aren't held into the reflectors as securely as others and can appear to flicker due to vibration, bumps and so forth. In this case the other lights will not flicker. A similar effect can happen when the bulb connections aren't positive.

If all the lights flicker it must be the voltage that is fluctuating due to poor wiring connections or a fluctuating charge rate/alternator performance.

Do the lights flicker when the engine is off??? Do they flicker when the engine is running??? Do they flicker when the car is in motion???You have to take all these factors into consideration before you post, and state every thing that is involved when you want some help.

Bad plugs on the bulbs.Bad grounded lights wiring.Bad alternator ground.Bad alternator charge.Bad lights switch.Also ,the new lamps may show more sensibility in voltange change or put more pressure on a older bad wiring link.

Best guess would be corroded ground wire connections to body and maybe a bad regulator off of the alternator/generator. In that respect the power would not be constat from the charging system and the bad ground may make you lights flicker from no clean connection.

Check your relay but most of the time it's your light switch that has gone bad. The swithch heat's up after a while and then that when the flickering happens if not stop working. Good luck and hope this helps